Tanager Lake (DNR ID: 27-0141)
Sampling Location GPS Coordinates: 44.9613N, -93.5613W Surface Area: 74 acres Max. Depth: 20 ft
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Tanager Lake is located near the city of Wayzata. Head east on Minnetonka Blvd, and turn left on Co Rd 101 S. Turn right at Grays Bay Blvd and enter the Grays Bay Marina and public access on the left side of the road.
Tanager Lake is on Lake Minnetonka which is a class 2B lake protected for aquatic life and recreation. Water quality information is available beginning in 2000. MCWD staff have been monitoring the site on Tanager Lake on a bi-weekly basis from the time of ice out (April) to the time of fall mixing (mid-October) since 2006.
Currently not available.
Monitoring season started in late April and ended in late October. A YSI multi-probe sonde was used to measure dissolved oxygen (DO), temperature (oC), pH, and specific conductivity (µS/cm) at each meter depth from the water surface to the bottom. Water samples were collected at one meter below the water surface and one meter from the bottom. Surface and bottom sample parameters analyzed included total phosphorus (TP), total dissolved phosphorus (TDP), soluble reactive phosphorus (SRP), total nitrogen (TN), total dissolved nitrogen (TDN), nitrate/nitrite (NO3/NO2) and ammonia (NH4). Surface concentrations of chlorophyll-a were also analyzed and measurements of Secchi disc depth were recorded.
| 2008 Summer Water Quality Summary |
| Parameters | Range | Mean | TSI Value | Lake Grade |
| Months | June - Sept. | May - Sept. | ||
| Secchi Depth (m) | 0.5 - 2.2 | 1.0 | 60 | D |
| Surface TP (µg/L) | 48 - 134 | 84.8 | 68 | D |
| Chlorophyll-a (µg/L) | 5 - 129 | 73.0 | 73 | D |
| Overall Score | 67 | D |
The following summary refers to Figure 3.49 (a-d).
- Secchi disk depth increased to 2.2 m by early June then decreased to 0.5 m by early September. The rest of the season secchi disk depth increased from 0.6 m to 1.7 m (standard > 1.2 m).
- Chlorophyll-a concentrations decreased from 41 µg/L to 5 µg/L from late April to early June. Concentrations increased to 129 µg/L by late August then declined to 21 µg/L by the middle of October (standard < 15 µg/L).
- Surface TP concentrations decreased from 102 µg/L to 41 µg/L from late April to late May. TP concentration increased to 134 µg/L by the middle of September, than declined by the end of the month. In October, concentrations increased to 96 µg/L (standard < 40 µg/L). Surface SRP concentrations were below detection limit (< 0.005 µg/L) for the season, except in late April, early June and the middle of October.
Lake Grades and Historical Monitoring Summaries
When available, previous reports are linked to applicable year. Additional lake data previous to 2007 may be available in the applicable year's hydrodata report. If you have additional questions or you are looking for specific information please contact MCWD's Water Quality Staff.
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